From a779dae5d38516943081d410d65ace286402dd4a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anton=20Luka=20=C5=A0ijanec?= <anton@sijanec.eu>
Date: Sat, 7 May 2022 00:37:25 +0200
Subject: =?UTF-8?q?grem=20na=20drug=20ra=C4=8Dunalnik,=20da=20dobim=20open?=
 =?UTF-8?q?gl=203.3?=
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---
 fiz/naloga/gl/helmholtz.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 fiz/naloga/gl/helmholtz.c

(limited to 'fiz/naloga/gl/helmholtz.c')

diff --git a/fiz/naloga/gl/helmholtz.c b/fiz/naloga/gl/helmholtz.c
new file mode 100644
index 0000000..7d8171b
--- /dev/null
+++ b/fiz/naloga/gl/helmholtz.c
@@ -0,0 +1,89 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <complex.h>
+#include <unistd.h>
+#include <GL/glxew.h>
+#include <GLFW/glfw3.h>
+extern char _binary_vertex_glsl_start[];
+extern char _binary_vertex_glsl_end[];
+extern char _binary_fragment_glsl_start[];
+extern char _binary_fragment_glsl_end[];
+void error_callback (int error, const char * description) {
+	fprintf(stderr, "error_callback: %s, error == %d\n", description, error);
+}
+void key_callback (GLFWwindow * okno, int tipka, int koda, int dejanje, int modifikatorji) {
+	fprintf(stderr, "tipka %d, koda %d, dejanje %d, modifikatorji %d, okno %p\n",
+			tipka, koda, dejanje, modifikatorji, (void *) okno);
+}
+int main (void) {
+	GLint vertex_len = _binary_vertex_glsl_end - _binary_vertex_glsl_start;
+	GLint fragment_len = _binary_fragment_glsl_end - _binary_fragment_glsl_start;
+	if (!glfwInit()) {
+		fprintf(stderr, "glfwInit failed\n");
+		return 1;
+	}
+	glfwSetErrorCallback(error_callback);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 1);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 4);
+	// glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // forward compat is ogl 3.0+
+	GLFWwindow * okno = glfwCreateWindow(800, 600, "okno", NULL, NULL);
+	if (!okno) {
+		fprintf(stderr, "glfwCreateWindow failed\n");
+		glfwTerminate();
+		return 2;
+	}
+	glfwMakeContextCurrent(okno);
+	GLenum err = glewInit();
+	if (err != GLEW_OK) {
+		fprintf(stderr, "glewInit failed: %s\n", glewGetErrorString(err));
+		return 3;
+	}
+	glfwSwapInterval(1); // vsync
+	glfwSetKeyCallback(okno, key_callback);
+	GLuint program = glCreateProgram();
+#define DO_SHADER(whi, WHI) \
+	GLuint whi##_shader = glCreateShader(GL_##WHI##_SHADER); \
+	glShaderSource(whi##_shader, 1, (const GLchar **) &_binary_##whi##_glsl_start, &whi##_len); \
+	glCompileShader(whi##_shader); \
+	GLint whi##_success = 0; \
+	glGetShaderiv(whi##_shader, GL_COMPILE_STATUS, &whi##_success); \
+	if (whi##_success == GL_FALSE) { \
+		GLint logSize = 0; \
+		glGetShaderiv(whi##_shader, GL_INFO_LOG_LENGTH, &logSize); \
+		char infoLog[logSize]; \
+		glGetShaderInfoLog(whi##_shader, logSize, &logSize, infoLog); \
+		fprintf(stderr, "prevod shaderja ni uspel. dnevnik:\n%s\n", infoLog); \
+		glDeleteShader(whi##_shader); \
+		return 4; \
+	} \
+	glAttachShader(program, whi##_shader);
+	DO_SHADER(vertex, VERTEX);
+	DO_SHADER(fragment, FRAGMENT);
+	glLinkProgram(program);
+	GLint isLinked = 0;
+	glGetProgramiv(program, GL_LINK_STATUS, &isLinked);
+	if (isLinked == GL_FALSE) {
+		GLint logSize = 0;
+		glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logSize);
+		char infoLog[logSize];
+		glGetProgramInfoLog(program, logSize, &logSize, infoLog);
+		fprintf(stderr, "linkanje programa ni uspelo. dnevnik:\n%s\n", infoLog);
+		glDeleteShader(vertex_shader);
+		glDeleteShader(fragment_shader);
+		glDeleteProgram(program);
+		return 5;
+	}
+	glDetachShader(program, vertex_shader); // TODO: ali lahko glDeleteShader po linku?
+	glDetachShader(program, fragment_shader);
+	while (!glfwWindowShouldClose(okno)) {
+		int w, h;
+		glfwGetFramebufferSize(okno, &w, &h);
+		glViewport(0, 0, w, h);
+		
+		glfwSwapBuffers(okno);
+		glfwWaitEvents(); // glfwPollEvents pa returna takoj
+	}
+	glfwDestroyWindow(okno);
+	glfwTerminate();
+	return 0;
+}
-- 
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